| Epc Energy Inc | C10 | 2022 | Active |
| Epicimpression Builders Inc | C10 + B, C36 | 2024 | Active |
| Ethos Electric Inc | C10 | 2020 | Active |
| European Rolling Shutters | C10 + D03, D52 | 1987 | Active |
| Evergreen Electric Group Inc | C10 | 2016 | Active |
| Evolt Electric Inc | C10 + B | 2024 | Active |
| Excalibur Builders Inc | C10 + B | 2018 | Active |
| Executive Av Inc | C10 + B | 2014 | Active |
| F M Electrical | C10 + B | 2017 | Active |
| Farris Electric Inc | C10 | 1986 | Active |
| Fast Elec | C10 | 2024 | Active |
| Fast Handy Electric Inc | C10 | 2013 | Active |
| Finish Line Electric Inc | C10 | 2018 | Active |
| Fire Alarm Systems | C10 + B, C16 | 2017 | Active |
| Four Seasons Construction | C10 + B, C27, C36 | 2024 | Active |
| Freon Inc | C10 + C20 | 2023 | Active |
| Frye Electric Inc | C10 | 2013 | Active |
| G Electric | C10 | 2019 | Active |
| G N H Company Electric Inc | C10 | 2020 | Active |
| Garza Electric Inc | C10 | 2010 | Active |
| GDL Builders Inc | C10 + B | 2026 | Active |
| General Electric Services Inc | C10 | 2019 | Active |
| Genj Construction Inc | C10 + A, B | 2025 | Active |
| GLD Green Energy | C10 + B, C20, C36 | 2006 | Active |
| Go Bay Electric Inc | C10 | 2022 | Active |
| Golden Electric JRR | C10 | 2023 | Active |
| Golden Pacific Systems | C10 + C7, D04 | 1989 | Active |
| Golden State Communications Inc | C10 | 2024 | Active |
| Green Leaf Solar & Electric Inc | C10 | 2005 | Active |
| GS General Construction Inc | C10 + B | 2025 | Active |
| Guild 33 Construction Inc | C10 + B | 2024 | Active |
| H H H Construction | C10 + B | 2019 | Active |
| Haxx Heating, Air & Electrical | C10 + C20 | 2021 | Active |
| Heredia Electric Inc | C10 + D09 | 2009 | Active |
| Hertz Electric | C10 | 2021 | Active |
| Hi-Tech Electric Inc | C10 | 2014 | Active |
| Highlight Solar Inc A California Corporation | C10 + B, C46 | 2011 | Active |
| Home Sufficiency Inc | C10 + B | 2025 | Active |
| HP Installations | C10 + B | 2026 | Active |
| I C S Integrated Communication Systems | C10 | 2002 | Active |
| I D C Engineering | C10 + A, C20, C36 +2 | 1998 | Active |
| I S A And Bros Inc | C10 | 2015 | Active |
| Ibm Electrical | C10 | 2024 | Active |
| Ibuild Development Inc | C10 + B | 2023 | Active |
| Indaspec LLC | C10 + C39 | 2015 | Active |
| Interstate Decisive Contractor-I D C | C10 + A, B, C15 +5 | 1982 | Active |
| Irbis Air Plumbing Electrical | C10 + C20, C36 | 2018 | Active |
| It Electric Pros | C10 + B | 2010 | Active |
| J A R Underground Electric Inc | C10 | 2019 | Active |
| J C Building America Inc | C10 + B | 2021 | Active |
| J Real Electric Inc | C10 | 2014 | Active |
| J S Precision Electric Inc | C10 | 1989 | Active |
| Jackson Electric Inc | C10 | 1989 | Active |
| Jahn Builders | C10 + B, C36 | 1996 | Active |
| JC Heating And Cooling Inc | C10 + C20, C38 | 2022 | Active |
| JMX Electric Inc | C10 | 2008 | Active |
| Johal Electrical Solutions | C10 | 2026 | Active |
| Jordan Electric Inc | C10 | 2018 | Renew by Dec 31, 2026 |
| JRT Electrical Services LLC | C10 | 2021 | Active |
| JT Handyman Service | C10 | 2023 | Active |
| Jullia Serge Construction & Electric Inc | C10 + B, C7 | 2004 | Active |
| Kaave Electric Company LLC | C10 | 2018 | Active |
| Kailey Air Systems | C10 + C20, C38 | 2022 | Active |
| KGB Digital System Services LLC The | C10 + C7 | 2018 | Renew by Dec 18, 2026 |
| KPN Builders Inc | C10 + B, C36 | 2021 | Active |
| Lakeshore Electric & Engineering Company Inc | C10 + A, C46 | 1991 | Active |
| Lawjas Construction Inc | C10 + B | 2020 | Active |
| Leader Design & Construction Corp | C10 + B, C20, C36 | 2011 | Active |
| Leading Edge Electric Inc | C10 | 2026 | Active |
| Lewis And Tibbitts Inc | C10 + A, C36, C42 | 1973 | Active |
| Lewis Anthony Incorporated | C10 + B | 2004 | Active |
| Liberty Electric Inc | C10 | 2024 | Active |
| Lightectron LLC | C10 | 2023 | Active |
| Liu's Construction Inc | C10 + B | 2020 | Active |
| Livewire Electric Services Inc | C10 | 2010 | Active |
| LP Builders Inc | C10 + B, C36 | 2020 | Active |
| M & B Iron Works | C10 + C23, D28 | 2018 | Active |
| M C L Electric | C10 | 2015 | Active |
| M Multiwire Electric Corp | C10 | 2017 | Active |
| Mayo Electric Inc | C10 | 2009 | Active |
| Mba Electric Inc | C10 | 2003 | Active |
| Mekong Delta Incorporation | C10 + B | 1994 | Active |
| Mid - State Electric Inc | C10 | 1999 | Active |
| Miranda Security Systems | C10 | 2005 | Active |
| Monster Builders Inc | C10 + B | 2016 | Renew by Nov 30, 2026 |
| Monte Power And Electric LLC | C10 | 2026 | Active |
| Mora Electrical Services Inc | C10 | 2022 | Active |
| MQ Mechanical Inc | C10 + B, C20, C38 | 2026 | Active |
| Mr Electric Of San Jose South | C10 | 2024 | Active |
| Mr Power Hyb Electrical Corporation | C10 | 2023 | Active |
| My Electrical & Construction | C10 + B, C7 | 2026 | Active |
| My Electrical LLC | C10 | 2024 | Active |
| NB Electric Inc | C10 | 2002 | Active |
| Neon Clean Power LLC | C10 | 2025 | Active |
| New Construction | C10 + B, C36 | 2023 | Active |
| Niko Electric Inc | C10 | 2018 | Active |
| NK Building Construction Group Inc | C10 + B | 2015 | Active |
| NKC Builders Inc | C10 + B | 2026 | Active |
| Noble Lion Electric LLC | C10 | 2026 | Active |
| Norcal General Construction Corporation | C10 + A | 2008 | Active |